What depth to connect two 10cm high sleepers? Does it need pilot holes?

No pilot holes needed , they are self drilling, recommend 150mm length, usually comes with hex driver bit

I'm guessing if we have two 10cm deep sleepers stacked, we need the 15cm screws not the 20cm screws to connect them?

The 15 cm screws will be more than good enough, I used them on 10cm sleepers and worked fine, though I did counter-sink the heads in by about 1 cm.

What size hex bit is needed for these?

If you are buying Amazon Item ‎FORSPETF150G which is the 6.3 x 150mm Advanced Timber Fixing Screws there is no hex driver bit in the box. Other answers said there was, which in part influenced me to buy. Other than that the screws look just fine and superior to the previous ones I bought from a well known builders merchants.

I'm only a DIYer, but I'd say no. I had to drill into the wood slightly to get them flush.

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Spectre Timber Framing Screws Torx | 6.3 x 150mm | Ruspert Green | Box 50

Spectre Timber Framing Screws Torx | 6.3 x 150mm | Ruspert Green | Box 50

Product ID: 198764209

Details

Exterior finish
Ruspert
Head style
Flat
Item dimensions L x W x H
17.5 x 12 x 5
Material
Steel
Thread size
Threaded

🌲Integrated flanged washer head for max timber grip

🔩Precision Torx drive for zero cam-out

🛡️Elite multi-layer Ruspert corrosion defense

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Description

🔧 Lock in strength, weatherproof your legacy.

CAM OUT PROOF TORX DRIVE - Deep star recess ensures flawless bit engagement, eliminating stripping and maximizing torque transfer for faster, hassle-free installs.
FLANGED WASHER HEAD POWER - Wide, low-profile hex head acts as a built-in washer, delivering superior clamping force and pull-through resistance on heavy structural timbers.
WEATHERPROOF RUSPERT SHIELD - Multi-layer green coating delivers unmatched salt spray and chemical resistance—built to brave the harshest outdoor conditions.
QUICK START THREAD TECHNOLOGY - Aggressive sharp threads and anti-split tip slice through dense wood fibers—no pilot holes needed, speeding up your build.
HEAVY DUTY STRUCTURAL STRENGTH - Specifically engineered for large timber frames, decking, and agricultural fencing—trusted by pros for permanent, rock-solid joins.

Spectre Timber Framing Screws 6.3 x 150mm feature a high-performance multi-layer green Ruspert coating for elite corrosion resistance, a cam-out proof Torx drive for maximum torque transfer, and an integrated flanged washer head for superior clamping force. Designed for heavy structural timber applications, these screws enable fast, pilot-hole-free installation with advanced quick-start threads, making them the go-to choice for professional-grade outdoor timber construction.

Specifications

ASIN	B0813CYL83
Best Sellers Rank	15,715 in DIY & Tools ( See Top 100 in DIY & Tools ) 230 in Screws (DIY & Tools)
Brand Name	Forgefix
Colour	Green
Compatible Groove Diameter	6.3 Millimeters
Country Of Origin	Taiwan
Customer Reviews	4.7 4.7 out of 5 stars (945)
Drive System	Phillips
EU Spare Part Availability Duration	1 Years
Exterior Finish	Ruspert
Fastener Size	6.3 x 150mm
Fastener Type	Screw with External Hex Drive
Finish Types	Ruspert
Head Type	Hex
Included Components	Spectre™ TimberFix Screws 6.3 x 150mm (Box 50)
Item Diameter	6.3 Millimetres
Item Dimensions	17.5 x 12 x 5 centimetres
Item Highlight	Multi-Layer Ruspert Anti-Corrosive Timber Screws Heavy-Duty Flanged Hex Torx Drive Structural Fasteners for Decking
Item Type Name	Spectre™ TimberFix Screws 6.3 x 150mm (Box 50)
Item Weight	1.33 Kilograms
Manufacturer	ForgeFix
Manufacturer Part Number	FORSPETF150G
Material Type	Steel
Metal	Alloy Steel
Model Number	FORSPETF150G
Number Of Items	50
Number of Packs	1
Number of Pieces	50
Outside Diameter	6.3 Millimetres
Screw Head Style	Flat
Screw Point Style	slash point
Set Name	Spectre Timber Fixing Screws (50 Piece)
Set Screw Thread Type	Metric
Size	6.3 x 150mm
Thread Class	3A
Thread Coverage	Partially Threaded
Thread Size	Threaded
Thread Style	Right Hand
Thread Type	Right hand
Unit Count	50.0 count

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7472 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

Secure transaction

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